Well, the 4 Japs and their baby 3 Jap siblings will soon have 4-6 new baby Japs hatch out and will need more room from their old brooder. It was about a 3ft square. I also have around 15 eggs due to hatch on the 16th, so they will be integrated to the Japs after a week or two of solitude, lol. I had to buy a new very expensive heater for my 90gallon aquarium, it's rated for only 75gal, so I had to get insulation foamboard. Had some extra and made a 4ft square brooder. Lined it with black plastic and then paper towels.